Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 848
Filtrar
1.
Sci Rep ; 13(1): 922, 2023 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-36650176

RESUMO

This study compared the relative risks of heat days on mortalities by vulnerable groups (elderly, single-person households, less-educated) in the past decade (1999-2008) and the recent decade (2009-2018) in four cities, Seoul, Incheon, Daegu, and Gwangju, in Korea. It has been known that the health impacts of heatwaves have gradually decreased over time due to socio-economic development, climate adaptation, and acclimatization. Contrary to general perception, we found that the recent relative risk of mortality caused by heat days has increased among vulnerable groups. It may associate with recent increasing trends of severe heat days due to climate change. The increasing relative risk was more significant in single-person households and less-educated groups than in the elderly. It implies that the impacts of climate change-induced severe heat days have been and will be concentrated on vulnerable groups. It suggests that social polarization and social isolation should be addressed to reduce heatwave impacts. Furthermore, this study shows the necessity of customized heatwave policies, which consider the characteristics of vulnerable groups.


Assuntos
Mudança Climática , Temperatura Alta , Humanos , Idoso , Temperatura , Coreia (Geográfico) , Cidades , Seul
2.
J Theor Biol ; 557: 111329, 2023 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-36309117

RESUMO

Susceptible-exposed-infectious-recovered (SEIR) models were applied to assess the effectiveness of non-pharmaceutical interventions (NPIs) and to study the dynamic behavior of the COVID-19 pandemic. Recently, SEIR models have evolved to address the change of human mobility by some NPIs for predicting the new confirmed cases. However, the models have serious limitations when applied to Seoul. Seoul has two representative quarantine policies, i.e. social distancing and the ban on gatherings. Effects of the two policies need to be reflected in different functional forms in the model because changes in human mobility do not fully reflect the ban on gatherings. Thus we propose a modified SEIR model to assess the effectiveness of social distancing, ban on gatherings and vaccination strategies. The application of the modified SEIR model was illustrated by comparing the model output with real data.


Assuntos
COVID-19 , Doenças Transmissíveis , Humanos , COVID-19/epidemiologia , COVID-19/prevenção & controle , Pandemias/prevenção & controle , Seul , Quarentena , Distanciamento Físico , Suscetibilidade a Doenças
3.
Emerg Infect Dis ; 29(1): 20-25, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36573519

RESUMO

Seoul orthohantavirus (SEOV) is not considered a major public health threat on the continent of Africa. However, Africa is exposed to rodentborne SEOV introduction events through maritime traffic after exponential growth of trade with the rest of the world. Serologic studies have already detected hantavirus antibodies in human populations, and recent investigations have confirmed circulation of hantavirus, including SEOV, in rat populations. Thus, SEOV is a possible emerging zoonotic risk in Africa. Moreover, the range of SEOV could rapidly expand, and transmission to humans could increase because of host switching from the usual brown rat (Rattus norvegicus) species, which is currently invading Africa, to the more widely installed black rat (R. rattus) species. Because of rapid economic development, environmental and climatic changes, and increased international trade, strengthened surveillance is urgently needed to prevent SEOV dissemination among humans in Africa.


Assuntos
Infecções por Hantavirus , Febre Hemorrágica com Síndrome Renal , Vírus Seoul , Animais , Ratos , Humanos , Comércio , Seul , Internacionalidade , Infecções por Hantavirus/epidemiologia , Infecções por Hantavirus/veterinária
4.
Artigo em Inglês | MEDLINE | ID: mdl-36498000

RESUMO

Understanding the relationship between land use/land cover (LULC) and land surface temperature (LST) has long been an area of interest in urban and environmental study fields. To examine this, existing studies have utilized both white-box and black-box approaches, including regression, decision tree, and artificial intelligence models. To overcome the limitations of previous models, this study adopted the explainable artificial intelligence (XAI) approach in examining the relationships between LULC and LST. By integrating the XGBoost and SHAP model, we developed the LST prediction model in Seoul and estimated the LST reduction effects after specific LULC changes. Results showed that the prediction accuracy of LST was maximized when landscape, topographic, and LULC features within a 150 m buffer radius were adopted as independent variables. Specifically, the existence of surrounding built-up and vegetation areas were found to be the most influencing factors in explaining LST. In this study, after the LULC changes from expressway to green areas, approximately 1.5 °C of decreasing LST was predicted. The findings of our study can be utilized for assessing and monitoring the thermal environmental impact of urban planning and projects. Also, this study can contribute to determining the priorities of different policy measures for improving the thermal environment.


Assuntos
Inteligência Artificial , Monitoramento Ambiental , Monitoramento Ambiental/métodos , Temperatura , Planejamento de Cidades , Seul
5.
BMJ Open ; 12(12): e064443, 2022 12 23.
Artigo em Inglês | MEDLINE | ID: mdl-36564124

RESUMO

OBJECTIVE: To describe the suffering experienced by patients with hypertension, not only regarding symptoms, but also suffering in a social context. DESIGN: A qualitative analysis of semi-structured interview data. Interviews were audio-recorded and transcribed verbatim. A descriptive approach was taken by exploring patient accounts and presenting their experiences and perspectives. SETTING: Cardiology clinic in a university hospital (Samsung Medical Center, Seoul, Republic of Korea). PARTICIPANTS: Patients with hypertension and without serious comorbidities who had been followed-up at a cardiology clinic of a training university hospital. RESULTS: Nineteen men and women (male:female=12:7) were interviewed. The mean age was 44 years, and the average hypertension duration was 4 years. All 19 patients reported symptoms allegedly to be associated with hypertension. Anxiety about blood pressure fluctuation and hypertension complications, dislike of antihypertensive medication and associated labelling effect, family stress and refusal to be enrolled in life insurance were commonly found among patients' interviews. Relatively younger (≤50 years of age), actively working patients experienced stigmatisation and discrimination in the workplace. CONCLUSION: The illness experience of patients with hypertension consists of suffering associated with threatened or damaged self-identity at the individual and social level. Medical professionals should have more awareness of the suffering of these patients to improve the quality of care. An education programme with proper focus on the elements of patients' suffering may help to alleviate it.


Assuntos
Hipertensão , Humanos , Masculino , Feminino , Adulto , Seul , Pesquisa Qualitativa , Hipertensão/tratamento farmacológico , República da Coreia , Ansiedade , Hospitais
6.
Artigo em Inglês | MEDLINE | ID: mdl-36554839

RESUMO

BACKGROUND: We evaluated vaccine effectiveness (VE) against infections with SARS-CoV-2 variants of concern in Seoul, the capital of the Republic of Korea, having the highest population density in the country, under real-world conditions. METHODS: We evaluated the reduction in the effectiveness of mRNA and viral-vector COVID-19 vaccines against infection by the SARS-CoV-2 delta variant in a subpopulation from April 2021 to July 2021 who visited screening clinics in Seoul using a test-negative case-control study design. Moreover, we conducted a case-control study matching the ten-year-old age group, sex, healthcare workers, and five districts of Seoul, which are considered confounding factors. RESULTS: The full VE in the pre-delta-dominant period was 95.0% (95% confidence interval [CI]: 91.2-97.2); however, it decreased to 61.1% (95% CI: 53.2-67.6) during the delta-dominant period. Notably, we found that COVID-19 VE was significantly decreased in individuals aged ≥80 years (52.9%, 95% CI: -9.9-79.8), men (50.6 %, 95% CI: 39.4-59.8), and asymptomatic individuals (49.8%, 95% CI: 36.5-60.3) during the widespread SARS-CoV-2 delta variant circulation. CONCLUSIONS: Vaccine-mediated protection drastically declined during the delta-dominant period and in vulnerable groups. This study suggests the requirement for additional countermeasures, such as the administration of a booster vaccine, in vulnerable groups based on age, sex, and symptomatic manifestation.


Assuntos
Vacinas contra COVID-19 , COVID-19 , Masculino , Humanos , Criança , SARS-CoV-2/genética , Seul , Estudos de Casos e Controles , Eficácia de Vacinas , COVID-19/epidemiologia , COVID-19/prevenção & controle
7.
Artigo em Inglês | MEDLINE | ID: mdl-36554492

RESUMO

In the Republic of Korea, the Environmental Health Act was amended in January 2021, making it mandatory for each local government to establish a plan for environmental health. Accordingly, the Seoul Metropolitan Government (SMG) must establish the Local Plan for Environmental Health (LPEH) to protect citizens' health from environmental hazards. The plan would support existing environmental health policies in Seoul to improve population health and achieve their goals. As a proof-of-concept to establish the LPEH, we developed a preliminary plan for environmental health in Seoul. We analyzed environmental health conditions of Seoul, identified driving conditions for execution of environmental health policies, set basic policy directions, and identified tasks needed to establish the preliminary plan. As a result, we established the vision and the goals of the preliminary plan. The vision is "a safe Seoul environment, healthy citizens". The strategies are "active monitoring of environmental health issues", "minimization of health damage and meticulous and systematic response", and "building a foundation for environmental health". To achieve the vision and the goals, we developed three strategies, eight tasks, and 25 sub-tasks. Under the preliminary plan we developed, we expect that SMG is able to protect citizens' health from threats of environmental hazards; improve environmental health conditions, especially in susceptible populations such as infants; and promote environmental justice.


Assuntos
Saúde Ambiental , Política Ambiental , Lactente , Humanos , Seul , Coreia (Geográfico) , República da Coreia
8.
Artigo em Inglês | MEDLINE | ID: mdl-36554284

RESUMO

The growing interest and usage of green space during the pandemic relates to why greenery increases enjoyment of daily life and alleviates troubles arising from infectious periods. However, it is necessary to understand what reactions to the degree of COVID-19's spread were expressed in hiking exercise characteristics (hiking frequency, actual movement distance, average speed, total exercise time). To understand the progress of forest usage behavior during the pandemic, we analyzed factors influencing hiking exercise characteristics and relationships between those factors and hiking exercise characteristics. Hiking record data were obtained (2019-2020) from the workout app "Tranggle" pertaining to hikers in their 20s and 30s who visited the 13 mountains in the Seoul Metropolitan Area most frequently. The differences in hiking exercise characteristics (2019 data subtracted from 2020) were linked with factor data that could be related to them, including the degree of COVID-19's spread (Rt). To explore relationships between hiking exercise characteristics and factors, we developed four models with a linear mixed model. We found that Rt, week, weekdays/weekends, and PM10 contributed to explaining the hiking exercise characteristics' differences. As a result of this analysis, the degree of COVID-19's spread (Rt) affected hiking frequency; the week affected hiking frequency and actual movement distance; weekdays or weekends affected hiking frequency, actual movement distance, average speed, and total exercise time; and PM10 affected hiking frequency. These findings indicate that hiking was an alternative way for those looking for a new strategy to replace lost opportunities for physical activity. Therefore, we conclude that it is necessary to induce the usage of green space so that many people can take advantage of the functions and benefits of greenery, which stood out during the pandemic era.


Assuntos
COVID-19 , Esportes , Humanos , Seul , COVID-19/epidemiologia , Exercício Físico , Movimento
9.
Sci Rep ; 12(1): 18456, 2022 Nov 02.
Artigo em Inglês | MEDLINE | ID: mdl-36323743

RESUMO

In this study, we determined the seasonal airborne microbial diversity profiles at SMRT stations by sequencing the 16S rRNA and ITS. Particulate matter samples were collected from air purifiers installed in the platform area of the SMRT subway stations. Three stations that included the most crowded one were selected for the sampling. The sampling was done at each season during 2019. After extracting the total DNA from all seasonal samples, PCR was performed with Illumina overhang adapter primers for the V3-V4 region of the 16S rRNA gene and ITS2 region of the ITS gene. The amplified products were further purified, and sequencing libraries were made. Sequencing was carried with the Illumina Miseq Sequencing system (Illumina, USA) followed by in-depth diversity analyses. The elemental composition of the particulate matter samples collected from the different subway stations were obtained using a WD-XRF spectrometer. The SMRT microbiome showed extensive taxonomic diversity with the most common bacterial genera at the subway stations associated with the skin. Overall, the stations included in this study harbored different phylogenetic communities based on α- and ß-diversity comparisons. Microbial assemblages also varied depending upon the season in which the samples were taken and the station. Major elements present at the subway stations were from aerosols generated between wheels and brake cushions and between the catenaries and the pantographs. This study shows that the microbial composition of the SMRT subway stations comes from a diverse combination of environmental and human sources, the season and the lifestyle of commuters.


Assuntos
Ferrovias , Humanos , Estações do Ano , RNA Ribossômico 16S/genética , RNA Ribossômico 16S/análise , Filogenia , Seul , Material Particulado/análise
10.
Artigo em Inglês | MEDLINE | ID: mdl-36429799

RESUMO

This study aimed to diagnose the health characteristics of people with grade 1-4 physical disability (but without intellectual disability) by analyzing factors affecting their health through social, epidemiological, behavioral, and ecological diagnoses by partially applying the PRECEDE model. Those registered with physical disability in 2022 and attending a welfare center were selected, with samples extracted from Seoul, Gyeonggi-do, Chungcheong-do, Jeolla-do, and Gyeongsang-do. A total of 1200 people were selected, and the data of 1000 people were finally analyzed. A frequency analysis was performed to identify the participants' characteristics. An independent t-test and one-way analysis of variance were performed to verify the hypotheses. To clarify the relationship between each variable, normality verification, confirmatory factor analysis, and structural equation model analysis were performed. First, the differences in factors influencing health promotion according to personal background variables (gender, age, and income level), including quality of life, showed partial differences according to age and income level. Second, according to disability-related variables (time of onset and disability grade), quality of life and health status showed partial differences. These results can be used as basic data or indicators to build a health promotion system that considers the health characteristics of individuals with a physical disability.


Assuntos
Pessoas com Deficiência , Deficiência Intelectual , Humanos , Qualidade de Vida , Nível de Saúde , Deficiência Intelectual/epidemiologia , Seul
11.
Artigo em Inglês | MEDLINE | ID: mdl-36430035

RESUMO

Due to global climate change, various countries have agreed upon the use of conventions. In this study, the eco-friendly vehicular policy on carbon neutrality implemented in Seoul, Korea, was examined. To this end, various policy-based scenarios were set, and the changes in automotive exhaust gas emissions were evaluated and compared. The evaluation method combined macroscopic and microscopic emission models as its analysis framework. Micro-traffic data available in Korea were used for analyses, and the results for all autonomous districts were derived to cover the entire area of Seoul. The findings confirmed that the most effective measure is the initial replacement of old, mid-size, or large diesel passenger cars with eco-friendly vehicles (Middle-sized: Scenario 2-1 5.52%, Scenario 2-2 6.86%, Scenario 3-1 80.93%, and Scenario 3-2 83.98%). The replacement of old vehicles exhibited the highest effect in all tested scenarios, while the initial replacement of diesel vehicles was more effective than the replacement of gasoline and liquified petroleum gas vehicles (Diesel: Scenario2-1 6.64%, Scenario 2-2 8.21%, Scenario3-1 86.23%, and Scenario 3-2 90.51%). Among the autonomous districts of Seoul, the Gangnam-gu area exhibited the largest emission-reduced effect among all the tested scenarios (Gangnam-gu: Scenario 2-1 5.80%, Scenario 2-2 6.74%, Scenario 3-1 80.44%, and Scenario 3-2 82.62%). Overall, it was demonstrated that the findings of this study may have significant policy implications in terms of urban emission changes pertaining to transportation.


Assuntos
Poluentes Atmosféricos , Poluição do Ar , Poluentes Atmosféricos/análise , Seul , Poluição do Ar/prevenção & controle , Poluição do Ar/análise , Emissões de Veículos/análise , República da Coreia
12.
Artigo em Inglês | MEDLINE | ID: mdl-36430091

RESUMO

To reduce the health burden from particulate matter (PM), the Korean government implemented a nationwide PM10 (particles less than 10 µg/m3 in diameter) alert system in 2015. The policy was intended to reduce PM exposure by advising people to refrain from outdoor activities on highly polluted days. The present study aimed to estimate the effect of the PM10 alert system on people's daily outdoor activity patterns using urban park (specifically, Children's Grand Park) visitation data from Seoul, South Korea, from 2014-2019. Segmented regression was fitted to estimate whether the number of visitors to the park decreased on the days with PM10 alerts. PM10 concentration of 80 µg/m3, the cut-off point for a "Bad" alert, was set as a threshold, and discontinuity at the threshold and change in the relative risk after the threshold was tested. Time series regression was used to estimate the dose-response line between the ambient PM10 concentration and the daily number of park visitors. The number of park visitors decreased by 11.8% (relative risk: 0.881, 95% confidence interval: 0.808, 0.960) when a "Bad" alert was issued (PM10 level above 80 µg/m3) compared to when the alert level was "Normal" (PM10 level less than 80 µg/m3). The present study found evidence that the PM10 alert influenced people's daily outdoor activities in Seoul, Korea. As the main purpose of the PM alert is to encourage people to refrain from outdoor activities, evaluating the relationship between PM alerts and behavior patterns can help to grasp the effectiveness of the policy. Further efforts should be made to investigate whether the observed behavioral change leads to reductions in health outcomes caused by PM.


Assuntos
Parques Recreativos , Material Particulado , Criança , Humanos , Seul , República da Coreia , Registros
13.
Nutrients ; 14(19)2022 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-36235554

RESUMO

Food-related content varies widely and is increasingly popular. Using various media, teenagers can easily access food content, which could affect they eating habits. This study was conducted to confirm the effects of watching motivation on the relationship between food content watching time and eating habits among adolescents in Seoul, Korea. Exactly 806 participants were surveyed about their food content watching status, including watching time and watching motivation. The Nutrition Quotient for adolescents (NQ-A) questionnaire was used to confirm eating habits. Exploratory factor analysis was conducted to classify watching motivation's subfactors. A parallel multimedia model was used to analyze the effect of watching motivation on the relationship between food content watching time and eating habits. As a result of this study, following the factor analysis, watching motivation was classified into information acquisition, emotional satisfaction, and enjoyment. The influence of food content watching time on NQ-A scores through information acquisition motivation was positively significant, whereas that through emotional satisfaction motivation was negatively significant. Enjoyment motivation did not indirectly affect the relationship between food content watching time and NQ-A scores. Hence, attention should be paid to these mediating factors when analyzing the relationship between watching food-related content and eating habits. Developing and distributing content that meets viewing motivations should help improve adolescents' eating habits.


Assuntos
Comportamento Alimentar , Motivação , Adolescente , Comportamento Alimentar/psicologia , Humanos , Estado Nutricional , República da Coreia , Seul
15.
Ecotoxicol Environ Saf ; 246: 114176, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-36257123

RESUMO

Mass transit systems, including subways and buses, are useful environments for studying the urban microbiome, as the vast majority of populations in urban areas use public transportation. Microbial communities in urban environments include both human- and environment-associated bacteria that play roles in health and pathogen transmission. In this study, we used shotgun metagenomic sequencing to profile microbial communities sampled from various surfaces found in subway stations and bus stops within the Seoul mass transit system. The metagenomic approach and network analysis were used to investigate broad-spectrum antibiotic resistance genes (ARGs) and their co-occurrence patterns. We uncovered 598 bacterial species in 76 samples collected from various surfaces within the Seoul mass transit system. All samples were dominated by the potential human pathogen Salmonella enterica (40 %) and the human skin bacterium Cutibacterium acnes (19 %). Significantly abundant biomarkers detected in subway station samples were associated with bacteria typically found in the human oral cavity and respiratory tract, whereas biomarkers detected in bus stop samples were associated with bacteria commonly found in soil, water, and plants. Temperature and location had significant effects on microbial community structure and diversity. In total, 41 unique ARG subtypes were identified, associated with single-drug or multidrug resistance to clinically important and extensively used antibiotics, including aminoglycosides, carbapenem, glycopeptide, and sulfonamides. We revealed that Seoul subway stations and bus stops possess unique microbiomes containing potential human pathogens and ARGs. These findings provide insights for refining location-specific responses to reduce exposure to potentially causative agents of infectious diseases, improving public health.


Assuntos
Antibacterianos , Metagenômica , Humanos , Antibacterianos/farmacologia , Seul , Resistência Microbiana a Medicamentos/genética , Bactérias/genética , Genes Bacterianos
16.
Emerg Infect Dis ; 28(11): 2147-2154, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-36287034

RESUMO

We investigated the proportion and characteristics of severe Corynebacterium striatum pneumonia in South Korea during 2014-2019. As part of an ongoing observational study of severe pneumonia among adult patients, we identified 27 severe C. striatum pneumonia cases. Most (70.4%) cases were hospital-acquired, and 51.9% of patients were immunocompromised. C. striatum cases among patients with severe hospital-acquired pneumonia (HAP) increased from 1.0% (2/200) during 2014-2015 to 5.4% (10/185) during 2018-2019, but methicillin-resistant Staphylococcus aureus (MRSA) infections among severe HAP cases decreased from 12.0% to 2.7% during the same timeframe. During 2018-2019, C. striatum was responsible for 13.3% of severe HAP cases from which bacterial pathogens were identified. The 90-day mortality rates were similarly high in the C. striatum and MRSA groups. C. striatum was a major cause of severe HAP and had high mortality rates. This pathogen is emerging as a possible cause for severe pneumonia, especially among immunocompromised patients.


Assuntos
Infecção Hospitalar , Staphylococcus aureus Resistente à Meticilina , Pneumonia , Adulto , Humanos , Infecção Hospitalar/microbiologia , Seul , Pneumonia/etiologia , Antibacterianos/uso terapêutico , Estudos Observacionais como Assunto
17.
Artigo em Inglês | MEDLINE | ID: mdl-36231361

RESUMO

Although more than two years have passed since the appearance of the coronavirus disease 2019 (COVID-19), few policies on public transportation have been implemented to reduce its spread. It is common knowledge that public transportation is vulnerable to COVID-19, but it has not been easy to formulate an appropriate public transportation policy based on a valid rationale. In this study, a modified SEIHR model was developed to evaluate the socioeconomic effects of public transportation policies. By applying the developed model to intercity buses in the Seoul metropolitan area, the socioeconomic efficiency of the policy of reducing the number of passengers was evaluated. The analysis showed that the optimal number of passengers decreased as the number of initially infected people increased; in addition, the basic reproduction number R0, illness cost per person, and probability of infection with a single virus were higher. However, depending on these variable conditions, the policy to reduce the number of passengers in a vehicle may not be required, so it is necessary to make an appropriate judgment according to the situation. In particular, the emergence of a new mutant COVID-19 will necessitate the development of appropriate countermeasures by comprehensively examining the change in the number of infected individuals and the fatality rate. This study can guide the development of such countermeasures.


Assuntos
COVID-19 , COVID-19/epidemiologia , Humanos , Veículos Automotores , Política Pública , Seul/epidemiologia , Meios de Transporte
18.
Medicine (Baltimore) ; 101(39): e30317, 2022 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-36181006

RESUMO

BACKGROUND: Thermoreceptors include TRPV1 and TRPM8. TRPV1 and TRPM8 are TRP channels. TRP ion channels are widely expressed in many different tissues and cell types, and are involved in different physiological processes. Research on the structure and basic physiological functions of TRPV1 is relatively perfect, and the relationship between the pathogenesis of other members of the TRP family and specific diseases and TRPV1 remains to be explored in depth. METHODS: Articles regarding TRP were culled from the Web of Science Core Collection, and knowledge maps were generated using the CiteSpace software. RESULTS: In total, 19,862 articles were included. The number of published articles on this topic has rapidly increased since 2000, with more than 1000 articles published per year by 2020. MAKOTO TOMINAGA was the author with the most articles. The countries with the most articles were the United States and China. However, the number of articles in the U.S. was 3 times that in China. The organizations that publish the most articles are Harvard University in the US and Seoul Natl University in South Korea. TRP and the pathogenesis of diseases, such as neuropathy and stroke, are hotspots of current research. CONCLUSION: To our knowledge, this is the first study to provide an overview of the literature on TRP. Research on TRPs is developing rapidly.


Assuntos
Receptores de Ativador de Plasminogênio Tipo Uroquinase , China , Humanos , República da Coreia , Seul , Estados Unidos
19.
Environ Pollut ; 315: 120379, 2022 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-36240964

RESUMO

Despite the effort to control SO2 emission, sulfate is still one of the major inorganic components of PM2.5 in urban area. Moreover, there is still a lack of understanding of the sulfate formation mechanism via SO2 oxidation under various ambient conditions. In this study, we focus on sulfate formation during a haze pollution episode in the spring/summertime of 2016 in Seoul Metropolitan Area (SMA). During the pollution episode, PM2.5 mass concentration exceeded over 60 µg m-3, and sulfate accounted for about 25% of the total PM2.5 mass concentration. A sharp increase of sulfur oxidation ratio (SOR) values along with aerosol liquid water content (AWC) under humid conditions could be ascribed to an apparent contribution of aqueous-phase oxidation of SO2 of sulfate formation during the pollution period. Comparisons of SOR values with four representative oxidants for the aqueous-phase oxidation (i.e., NO2, H2O2, O3, and TMIs) indicated that TMIs concentration, especially for Mn (II), showed the best positive correlation. Furthermore, for calculating the sulfate production rate, the contribution of TMIs concentration was found to be dominant within the pH range in SMA (2.1-3.0), which was determined by the chemical composition and derived AWC. These results imply that not only the SO2 emission but also other chemical components (e.g., TMI and nitrate) would play a critical combined role in sulfate formation under urban haze condition.


Assuntos
Poluentes Atmosféricos , Oligoelementos , Material Particulado/análise , Poluentes Atmosféricos/análise , Sulfatos/análise , Monitoramento Ambiental/métodos , Peróxido de Hidrogênio , Seul , Aerossóis/análise , Estações do Ano , Óxidos de Enxofre , China
20.
Asia Pac J Public Health ; 34(8): 824-831, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-36112980

RESUMO

Coronavirus disease (COVID-19) is caused by infection with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and presents with mild to severe symptoms. Vaccines have been developed, but COVID-19 persists. Therefore, it is necessary to analyze big data at an early stage to establish an effective infection prevention strategy. To reduce SARS-CoV-2 infection, this study aimed to analyze the infection factors by region within Seoul, Korea and identify the major factors affecting the infection rate. For ease of data aggregation, the study was conducted after a data refinement operation that organized data in the same group into categories, and classified them in detail by specific keywords. Based on the results of this study, if preventive measures are established after identifying the representative infectious factors, periods, and routes of COVID-19 infection, the infection rate could be effectively reduced in the future.


Assuntos
COVID-19 , Humanos , SARS-CoV-2 , Big Data , Análise de Dados , Seul/epidemiologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...